In geometry, the gyroelongated bipyramids are an infinite set of polyhedra, constructed by elongating an n-gonal bipyramid by inserting an n-gonal antiprism between its congruent halves.

Three members of the set can be deltahedra, that is, constructed entirely of equilateral triangles: the gyroelongated square bipyramid, a Johnson solid; the icosahedron, a Platonic solid; and the gyroelongated triangular bipyramid if it is made with equilateral triangles, but because it has coplanar faces is not strictly convex. With pairs of triangles merged into rhombi, it can be seen as a trigonal trapezohedron. The other members can be constructed with isosceles triangles.

More information n, Type ...

n	3	4	5	6	n
Type	Coplanar	Equilateral	Regular	Coplanar
Shape	Gyroelongated triangular bipyramid	Gyroelongated square bipyramid	Gyroelongated pentagonal bipyramid (icosahedron)	Gyroelongated hexagonal bipyramid	Gyroelongated bipyramid
Image
Faces	12	16	20	24	4n
Dual	Triangular truncated trapezohedron	Square truncated trapezohedron	Pentagonal truncated trapezohedron (Dodecahedron)	Hexagonal truncated trapezohedron	Truncated trapezohedra

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• Elongated bipyramid
• Gyroelongated pyramid
• Elongated pyramid
• Diminished trapezohedron

• Conway Notation for Polyhedra Try: "knAn", where n=4,5,6... example "k5A5" is an icosahedron.

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